Torsten Rüger
fd46826b9c
as they are just the type of the meta_class, that was relatively simple. I feel this is what oo is meant to be, instance variables and methods for the objects, and since classes are objects, for them too. Class variables seem like a design mistake, weird scoping rules and no data hiding (left as an exercise to the reader)
100 lines
3.4 KiB
Ruby
100 lines
3.4 KiB
Ruby
# Class is mainly a list of methods with a name.
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# The methods are untyped, sis VoolMethod.
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# The memory layout of an object is determined by the Type (see there).
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# The class carries the "current" type, ie the type an object would be if you
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# created an instance of the class.
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# Note that this changes over time and so many types share the same class.
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# For dynamic OO it is essential that the class (the object defining the class)
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# can carry methods. It does so in an instance variable methods.
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# An Object carries the data for the instance variables it has.
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# The Type lists the names of the instance variables
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# The Class keeps a list of instance methods, these have a name and (vool) code
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# Each type in turn has a list of CallableMethods that hold binary code
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module Parfait
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class Class < Object
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include Behaviour
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attr_reader :instance_type , :name , :instance_methods
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attr_reader :super_class_name , :meta_class
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def self.type_length
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6
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end
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def self.memory_size
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8
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end
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def initialize( name , superclass , instance_type)
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super()
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@name = name
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@super_class_name = superclass
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@instance_methods = List.new
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@instance_type = instance_type
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@meta_class = MetaClass.new( self )
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end
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def rxf_reference_name
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name
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end
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def inspect
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"Class(#{name})"
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end
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def add_method_for(name , type , frame , body )
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method = Parfait::VoolMethod.new(name , type , frame , body )
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add_method( method )
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method
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end
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def add_method(method)
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raise "Must be untyped method #{method}" unless method.is_a? Parfait::VoolMethod
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@instance_methods.push(method)
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end
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def get_method(name)
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@instance_methods.find{|m| m.name == name }
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end
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# adding an instance changes the instance_type to include that variable
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def add_instance_variable( name , type)
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@instance_type = @instance_type.add_instance_variable( name , type )
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end
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# return the super class, but raise exception if either the super class name
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# or the super classs is nil.
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# Use only for non Object base class
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def super_class!
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raise "No super_class for class #{@name}" unless @super_class_name
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s = super_class
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raise "superclass not found for class #{@name} (#{@super_class_name})" unless s
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s
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end
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# return the super class
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# we only store the name, and so have to resolve.
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# Nil name means no superclass, and so nil is a valid return value
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def super_class
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return nil unless @super_class_name
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Object.object_space.get_class_by_name(@super_class_name)
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end
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# ruby 2.1 list (just for reference, keep at bottom)
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#:allocate, :new, :superclass
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# + modules
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# :<, :<=, :>, :>=, :included_modules, :include?, :name, :ancestors, :instance_methods, :public_instance_methods,
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# :protected_instance_methods, :private_instance_methods, :constants, :const_get, :const_set, :const_defined?,
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# :const_missing, :class_variables, :remove_class_variable, :class_variable_get, :class_variable_set,
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# :class_variable_defined?, :public_constant, :private_constant, :singleton_class?, :include, :prepend,
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# :module_exec, :class_exec, :module_eval, :class_eval, :method_defined?, :public_method_defined?,
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# :private_method_defined?, :protected_method_defined?, :public_class_method, :private_class_method, :autoload,
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# :autoload?, :instance_method, :public_instance_method
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end
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end
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